Isotopic DMT as a Probe of Spin-Dependent Psychedelic Pharmacology

A three-phase experimental protocol tests whether the radical pair mechanism (RPM) operates during DMT-induced psychedelic states at the 5-HT2A receptor. Position-specific isotopic substitution of the ligand (13C at C3a, 15N on indole nitrogen) alters nuclear spin content without changing molecular geometry, receptor affinity, or metabolic half-life. Because the kinetic isotope effect is negligible for 13C (Δm = +8%, KIE < 1.04), any observed phenomenological change would constitute direct evidence for the magnetic isotope effect and RPM involvement at the receptor. Structure-guided labelling (PDB: 9AS1), falsification criteria, and a ~$10,000 mouse HTR pilot are described.

Study at a glance

Abstract

We propose a three-phase experimental protocol testing whether the radical pair mechanism (RPM) operates during N,N-dimethyltryptamine (DMT)-induced psychedelicstates at the 5-HT2A receptor. Position-specific isotopic substitution of the ligand (13C at C3a, 15N on indole nitrogen) modifies nuclear spin content without altering molecular geometry, receptor affinity, or metabolic half-life.Because the kinetic isotope effect is negligible for 13C (Δm = +8%, KIE < 1.04), any observed phenomenological change constitutes direct evidence for the magnetic isotope effect—and hence for RPM involvement—at the receptor. Structure-guided labelling (PDB: 9AS1), falsification criteria, and a ~$10,000 mouse HTR pilot are described. Version 2: removed speculative theoretical framework, muscled bibliography (46 refs), added quantitative feasibility bounds, integrated as part of a three-document research programme.